Stop motion for looms



May 19, 1925.

y .i. NORTHROP STOP MOTION LOOMS Filed Jan. 27, 1923 5 Sheets Sheet 1 May 19, 1925. 1,538,053

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May 19, 1925; 1,538,053

J. NORTHROP STOP MOTION FOR LOOMS File Jan. 27; 1923 5 Sheets-Sheet 5 I Ira/677% 7 I wmwss;

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04 MAL/ 4: 4/ M/ M Patented May 19, 1925.

UNITED STATES PATENT OFFICE.

JONAS'NORTHROP, OF HOPEDALE, MASSACHUSETTS, ASSIGNOR TO HOPEDALE MANU- FACTURING- COMPANY, OF -MILFORD, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

s'ror MOTION non LOOMS.

- Application filed January 27, 1923. Serial No. 615,853.

To all whom it may concern:

Be it known that I, JoNAs Non'rnnor, a citizen of the United States, residing at l-Iopedale, in the county of Worcester and State of Massachusetts, have invented certain new and useful Improvements in Stop Motions for Looms; and I do hereby declare the following to be a full, clear, and

exact description of the invention, such as will enable others skilled in the art to which zlippertains to make and use the same.

e present invention relates to stop motions for looms. I

The object of the invention is to reorganize and improve stop, motions for looms, and particularly the warp stop and protector mechanisms. To this end the resent invention consists in the stop nfotion hereinafter described and particularly defined in the claims. 1

In the accom anying drawings Figure I is a right han side elevation of a ,warp stop motion embodying theseveral features of the present invention shown mounted in position upon a. loom; Fig. 2 is a left hand elevation of the improved warp stop motion under normal running conditions; Fig. 3 is an elevation of the improved warp stop motion shown in Fig. 2, showing the manner of operation uponobstruction of the detector member due to the failure of one of the warp threads; Fig.4 is a plan view of the apparatus shown in Fig. 2; Fig. 5. is.

a section on line 55 of Fig. 2; Fig. 6 is a section on line 66 of Fig: 2; Figs. 7 and 8 are details showing the position of a part of the knock-off mechanism in running condition; Fig. 9 is a detail view of the mecha nism shown in Figs. 7 and 8 set to cause knock-off of the loom; and Fig. 10 is'a detail showing the connections between the knock-off mechanism and the shipper mech anism. to stop the loom.

According to the present invention the warp stop motion operates to initiate the stopping of the loom as the lay approaches back cen ter, while the protector mechanism operates to knock off the loom "as the lay moves forward. The illustrated embodiment of the invention comprises a detector mechanism having a detector of the usual form adapted to be oscillated under the drop wires by an oscillating actuatormechanism.. 1 The actuator mechanism includes {an actuator The motion" of the actuator lever is trafismitted to the detector through a rock lever mounted upon the shaft with the actuator lever and a slidable dog engaging aligned surfaces of the actuator lever and the rock lever, this dog being designed to normally oscillate with the actuator lever, but to rise and actuate an overhanging trip lever upon obstruction of the detector. The operation of the trip lever brings a suitable drop link into the path of a dagger, which may .be oscillated in any convenient-manner but is preferably connected to the lay of the loom. In order to cause knocking-01f as 'the .lay approaches back center, the drop link is connected by a suitable rod to a knock-off lever which actuates the shipper mechanism. The knock-off lever may be pivoted upon any suitable part of the loom but is preferably pivoted on the frog which is normally stationary but adaptedto'be pushed forward to prevent a smash. The knock-oif lever is therefore common to both the warp stop motion and the protector mechanism.

lated by the weft hammer lever 32 with v which it is connected by a link 34. The wefthammer lever receives its motion from a cam 36 in the usual manner. The rock lever 22 is provided with a laterally extending hub 38 having a flattened or slabbed upper surface 40, aligning with a similar slabbed surface the curvature being concentric with the hub 24. The dog is normally maintained in engagement with the two levers by a spring 52 bearing at one end against the hub of the ac tuator lever 30 and received at the other end in a cup 54 attached to the dog. It will be seen that as long as the detector member is free to oscillate beneath the warps, the motion of the actuator lever will be imparted to the rock lever through the dog 44 because of the flat surface of the dog in engagement with the aligned surfaces presented by the rock lever and the actuator lever. However, upon release of one of the drop wires due to a failure of the corresponding warp, the detector 16 is arrested in its motion, as indicated in Fig. 3, thereby stoppingthe rock lever 22. The continued oscillation of the actuator lever 30 carries with it the dog 44 which is caused'to rise over the 'corner presented by the flattened surface of the rock lever, thus initiating knock-0T1" of the loom in a manner to be presently explained.

The construction of the knock-off mechanism which, through the motion of the dog 44 is caused to actuate the shipper mechanism of the loom, forms a feature of the invention and will now be described. Resting upon the curved upper surface 50 of the dog vis a trip lever 58 pivoted at 60 on bracket 26 attached to the frame ofithe machine. The trip lever is pivotedat its end with a drop link 64 which is adapted to be moved into the path of-an oscillating dagger to cause knocking-0H5 of the loom when the lever 58 is raised. The dro link is provided with a pair of projecting lugs 68 and 7 O'which are normally urged against the respective bear-' ing surfaces 72 and 74 of a bracket 66 by means of a spring 78. The lug is provided with a sloping surface 7 6 opposite a similarly disposed surface of, the bracket. The drop link and bracket normally assume the position shown in Figs. 7 and 8 but upon raising of the trip lever 58, the drop link movesint the position shown in Fig. 9, the lug 68 now bearing against the upper sur face of the bracket. In this positior the link is placedin the path of an oscillating dagger which normally passes between the racket and the drop link and which is now adapted to actuate the drop link to knock off the loom. The dagger may be oscillated by any suitable means but is prefer: ,ably connected with the lay 10 of the loom to cause knock-01f as 'thelay approaches backcenter. It will be seen that t e construction of the drop link and bracket allows automatic re-setting of the mechanism as soon as the broken warp is repaired. The weight of the drop link and trip lever forces the former downwardly against the bracket and due to the surfaces of the lug 70 the link assumes its original position against the bracket, as indicated in Fig. 8.

any normally stationary part of the loom,

the end of the knock-off lever being arranged to bear against the shipper which. is indicated generally at 90 and which forms no part of the present invention. As previously stated, the bracket 88 is preferably con- .nected to the frog 92 which is normally stationary but which is adapted to slide forward to stop the loom to prevent a smash. In this case itwill be seen that the lever 82 will be fulcrumed about its connection with the rod 84,.the forward motion of the frog 90 tending to move the knock-off lever 82 and actuate the shipper mechanism, as beore.

The present invention possesses the advantage of utilizing in a convenient manner a part of the same knock-ofi mechanism common to both the warp stop .motion and the protector mechanism. In the illustrated embodiment of the invention the warp stop motion sets the apparatus to initiate knockoff as the lay approaches back center, at the same time allowing the protector mechanism to initiate stopping as the lay beats forward. v

The construction of the various parts of the apparatus is such as to cause positive functioning of the warp stop and protector mechanisms when it becomes necessary to knock o'lf the loom due to failure of any of the warps or toprevent a smash. The particular warp stop motion including the rack and actuator levers and the sliding-dog is designed to positively act upon a slight obstruction of the detector member. Furthermore, this mechanism is simple in its action and possesses better wearing qualities than previously existing types of warp stop motious.

-' While it is preferred to employ the specific construction and arrangement of parts shown and described, it will be understood that this construction and arrangement is not essential except so far, as specified in the claims and may be changed or modified without departing from the broader features of the invention.

The invention having been described, what is claimed is: i

1. A warp stop motion for looms having,

in combination, drop wires, a detector, a detector lever adapted to oscillate the detector beneath the warps, a rock lever connected with the detector lever and provided with a slabbed bearing surface, an actuator lever having a slabbed surface aligning with cillatin rock lever and actuator lever, means for oscillating the actuator lever, and a knockofi' mechanism having a trip lever in normal inoperative engagement with the dog.

- 2. A warp stop motion for looms having,

in combination, drop wires and associated arts, a detector, a rock lever, connections tween the rock lever and the detector to oscillate the detector'beneath the drop wires, an actuator lever provided with a longitudinal slot, the rock and actuator levers-being provided with aligning engagement surfaces, a dog received in the slot of the actuator lever and having an overhang bearing upon the engagement surfaces of the rock and actuator levers, and a knock-off mechanism including a trip lever in normal inoperative engagement with the overhang.

3. A warp stop motion for looms having, in combination, drop wires, a detector osbeneath the drop wires, an oscillating agger, a normally inoperative drop link provided with a projecting lug, a bracket engagingthe In to hold the link out of the path of the agger, means connected with the detector for moving the link into engagement with the dagger, and means for knocking 011' the loom upon engagement of the dagger and thelink, said lug-of the drop link having surfaces disposed with respect to the cooperating bracket to allow of automatic re-setting of the link.

4. A warp stop motion for looms having,

in combination, drop wires, a detector mechanism and associated parts, a knock ofi mechanism COIIIPI'lSlIlg "a trip lever, a link connected with the trip lever and having a projecting lug adjacent one end, an oscillating dagger, means engaging the lug of the drop link to normally maintain the drop link out of the path of the dagger', means for placing the drop link in the path of the dagger upon actuation or the trip lever, a-

shipper mechanism, and connections between the drop link 'and the shipper mechanism to knock off the loom.

.5. A warp stop motion for looms having, in combination, drop wires, a detector mechanism, an actuator lever, a trip lever, a dog connected-With the actuator lever and adapted to move the trip lever upon stoppage of the detector mechanism, a link connected with the trip lever and provided with projecting lugs, an oscillating dagger, a bracket engaging the lugs and adapted to maintain the link out of the path of the dagger, a release lever fulcrumed about some stationary part of the loom and adapted to engage a shipper mechanism, and connections between the link and the r lease lever.

6. A loom having in/jj mbination, a lay, a warp stop motionf faf 1,, ector mechanism including a sliding'frog', knock-ofl lever mounted upon the frog and connected with the warp stop motion in a manner to cause knocking off of the loom near back center of the lay when the warp stop motion is actuated and during forward movement of the lay when the protector mechanism is actu ated.-

JONAS NORTHROP. 

